Consider improvements to the backup experience to support long filenames/directory names

[Robin]

Large filenames cause problems, especially with blob-based storage (e.g. S3-compatible services have a key limit of 1024). This gives problems quite easily with hierarchical storage like syncthing where one might have a set of nested folders that quite easily hit that key limit, especially combined with encryption.

Disabling encryption altogether is not desirable in many cases, but it could be worthwhile to allow disabling filename encryption, in some cases.

(As a longer term project, it may also be worth considering ways to circumvent this limit altogether.)

See https://forum.cloudron.io/topic/3050/backup-feedback-minio/ for the initial discussion leading to this request.

[girish]

If someone knows how other tools handle it would be great. I know rclone has similar restrictions as us - https://rclone.org/crypt/#name-encryption