Tiers

Rclone backends are divided into tiers to give users an idea of the stability of each backend.

Tier	Label	Intended meaning
Tier 1	Core	Production-grade, first-class
Tier 2	Stable	Well-supported, minor gaps
Tier 3	Supported	Works for many uses; known caveats
Tier 4	Experimental	Use with care; expect gaps/changes
Tier 5	Deprecated	No longer maintained or supported

Overview

Here is a summary of all backends:

Backend	Tier	Maintainers	Features	Tests	Integrity	Perf	Adoption	Docs	Security
Alias	Tier 1	Core	7	✔ Passing	Hash	High	Widely used	Full	High
Archive	Tier 3	Core	3	✔ Passing	Hash	High	Some use	Full	High
Azure Blob	Tier 1	Core	7	✔ Passing	Hash	High	Widely used	Full	High
Azure Files	Tier 2	Core	6	✔ Passing	Hash	High	Widely used	Full	High
B2	Tier 1	Core	6	✔ Passing	Hash	High	Widely used	Full	High
Box	Tier 1	Core	6	✔ Passing	Hash	High	Widely used	Full	High
Cache	Tier 5	None	7	✔ Passing	Hash	High	Some use	Full	High
Chunker	Tier 4	None	7	✔ Passing	Hash	High	Some use	Full	High
Cloudinary	Tier 3	Core	3	✖ Failing	Hash	High	Often used	Full	High
Combine	Tier 1	Core	7	✔ Passing	Hash	High	Often used	Full	High
Compress	Tier 4	Core	5	✖ Failing	Hash	Medium	Some use	Full	High
Crypt	Tier 1	Core	7	✔ Passing	Hash	High	Widely used	Full	High
Doi	Tier 2	External	0	✖ N/A	Other	High	Some use	Full	High
Drime	Tier 1	Core	4	✔ Passing	High	High	Some use	Full	High
Drive	Tier 1	Core	7	✔ Passing	Hash	High	Widely used	Full	High
Dropbox	Tier 1	Core	6	✔ Passing	Hash	High	Widely used	Full	High
Fichier	Tier 3	Core	2	✔ Passing	Hash	Medium	Some use	Full	High
Filefabric	Tier 4	Core	3	✖ Failing	Modtime	Medium	Some use	Full	High
Filelu	Tier 1	Core	1	✔ Passing	Hash	High	Widely used	Full	High
Filen	Tier 1	External	6	✔ Passing	Hash	High	Some use	Full	High
Filescom	Tier 1	Core	5	✔ Passing	Hash	High	Widely used	Full	High
FTP	Tier 1	Core	4	✔ Passing	Modtime	High	Widely used	Full	Varies
Gofile	Tier 1	Core	5	✔ Passing	Hash	High	Often used	Full	High
Google Cloud Storage	Tier 1	Core	6	✔ Passing	Hash	High	Widely used	Full	High
Google Photos	Tier 5	None	0	✖ Failing	Other	Low	Some use	Full	High
Hasher	Tier 4	Core	7	✔ Passing	Hash	High	Some use	Full	High
HDFS	Tier 2	Core	4	✔ Passing	Modtime	Medium	Some use	Full	High
Hidrive	Tier 1	Core	5	✔ Passing	Hash	Medium	Often used	Full	High
HTTP	Tier 3	Core	0	✖ N/A	Other	High	Widely used	Full	Varies
Iclouddrive	Tier 4	External	3	✖ Flaky	Modtime	Low	Some use	Full	High
Imagekit	Tier 1	External	0	✔ Passing	Other	High	Some use	Full	High
Internet Archive	Tier 3	Core	5	✖ Failing	Hash	Medium	Widely used	Full	High
Internxt	Tier 2	External	0	✔ Passing	Other	High	Some use	Full	High
Jottacloud	Tier 2	Core	6	✖ Flaky	Hash	High	Widely used	Full	High
Koofr	Tier 2	Core	5	✔ Passing	Hash	High	Widely used	Full	High
Linkbox	Tier 5	Core	2	✖ Failing	Modtime	High	Often used	Basic	High
Local	Tier 1	Core	7	✔ Passing	Hash	High	Widely used	Full	High
Mailru	Tier 1	External	6	✔ Passing	Hash	Medium	Often used	Full	High
Mega	Tier 2	Core	3	✖ Flaky	Other	High	Widely used	Full	High
Memory	Tier 1	Core	4	✔ Passing	Hash	High	Widely used	Full	High
Netstorage	Tier 1	Core	3	✔ Passing	Hash	High	Some use	Full	High
Onedrive	Tier 1	Core	6	✖ Flaky	Hash	High	Widely used	Full	High
Opendrive	Tier 1	Core	5	✔ Passing	Hash	High	Often used	Full	High
Oracle Object Storage	Tier 1	Core	6	✔ Passing	Hash	High	Widely used	Full	High
Pcloud	Tier 1	Core	5	✔ Passing	Hash	High	Often used	Full	High
Pikpak	Tier 1	External	5	✔ Passing	Hash	High	Often used	Full	High
Pixeldrain	Tier 1	Core	7	✔ Passing	Hash	High	Widely used	Full	High
Premiumizeme	Tier 3	Core	2	✔ Passing	Other	High	Some use	Full	High
Proton Drive	Tier 5	None	4	✖ Failing	Hash	High	Often used	Full	High
Putio	Tier 2	Core	5	✖ Flaky	Hash	Low	Often used	Full	High
Qingstor	Tier 3	Core	3	✖ Disabled	Hash	High	Often used	Full	High
Quatrix	Tier 3	Core	3	✔ Passing	Hash	High	Often used	Full	High
S3	Tier 1	Core	7	✔ Passing	Hash	High	Widely used	Full	High
Seafile	Tier 3	Core	3	✖ Failing	Other	Medium	Some use	Basic	High
SFTP	Tier 1	Core	5	✔ Passing	Hash	High	Widely used	Full	High
Shade	Tier 1	External	0	✔ Passing	Other	High	Some use	Full	High
Sharefile	Tier 5	Core	4	✖ Disabled	Modtime	Medium	Some use	Full	High
Sia	Tier 4	Core	1	✖ Failing	Other	Medium	Some use	Full	High
SMB	Tier 2	External	5	✔ Passing	Modtime	Medium	Some use	Full	High
Storj	Tier 1	Core	4	✔ Passing	Modtime	High	Widely used	Full	High
Sugarsync	Tier 3	Core	3	✔ Passing	Other	Medium	Some use	Full	High
Swift	Tier 1	Core	4	✔ Passing	Hash	High	Widely used	Full	High
Ulozto	Tier 3	Core	3	✖ Failing	Hash	Medium	Often used	Full	High
Union	Tier 1	Core	7	✔ Passing	Hash	High	Often used	Full	High
WebDAV	Tier 1	Core	5	✔ Passing	Hash	Low	Widely used	Full	High
Yandex	Tier 1	External	5	✔ Passing	Hash	High	Often used	Full	High
Zoho	Tier 3	External	2	✖ Failing	Other	Medium	Often used	Full	High

Scoring

Here is how the backends are scored.

Features

These are useful optional features a backend should have in rough order of importance. Each one of these scores a point for the Features column.

• F1: Hash(es)
• F2: Modtime
• F3: Stream upload
• F4: Copy/Move
• F5: DirMove
• F6: Metadata
• F7: MultipartUpload

Tier

The tier is decided after determining these attributes. Some discretion is allowed in tiering as some of these attributes are more important than others.

Attr	T1: Core	T2: Stable	T3: Supported	T4: Experimental	T5: Incubator
Maintainers	>=2	>=1	>=1	>=0	>=0
API source	Official	Official	Either	Either	Either
Features (F1-F7)	>=5/7	>=4/7	>=3/7	>=2/7	N/A
Integration tests	All Green	All green	Nearly all green	Some Flaky	N/A
Error handling	Pacer	Pacer	Retries	Retries	N/A
Data integrity	Hashes, alt, modtime	Hashes or alt	Hash OR modtime	Best-effort	N/A
Perf baseline	Bench within 2x S3	Bench doc	Anecdotal OK	Optional	N/A
Adoption	widely used	often used	some use	N/A	N/A
Docs completeness	Full	Full	Basic	Minimal	Minimal
Security	Principle-of-least-privilege	Reasonable scopes	Basic auth	Works	Works