rclone/docs/content/bugs.md

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Bugs Rclone Bugs and Limitations

Bugs and Limitations

Limitations

Directory timestamps aren't preserved on some backends

As of v1.66, rclone supports syncing directory modtimes, if the backend
supports it. Some backends do not support it -- see
overview for a complete list. Additionally, note
that empty directories are not synced by default (this can be enabled with
--create-empty-src-dirs.)

Rclone struggles with millions of files in a directory/bucket

Currently rclone loads each directory/bucket entirely into memory before
using it. Since each rclone object takes 0.5k-1k of memory this can take
a very long time and use a large amount of memory.

Millions of files in a directory tends to occur on bucket-based remotes
(e.g. S3 buckets) since those remotes do not segregate subdirectories within
the bucket.

Bucket-based remotes and folders

Bucket-based remotes (e.g. S3/GCS/Swift/B2) do not have a concept of
directories. Rclone therefore cannot create directories in them which
means that empty directories on a bucket-based remote will tend to
disappear.

Some software creates empty keys ending in / as directory markers.
Rclone doesn't do this as it potentially creates more objects and
costs more. This ability may be added in the future (probably via a
flag/option).

Bugs

Bugs are stored in rclone's GitHub project: