v23.9.0

• S3 support! Enable it with cargo install --features s3, then e.g. cargo backup s3://mybucket.example/.

• Performance: A simple cache of retrieved decompressed blocks now speeds up restores, especially on relatively slow storage like S3.

• --debug now shows on stderr only debug messages from Conserve itself and not from dependencies. All the messages are still recorded to the --log-json file if that is given.

• Robustness: during backup, if the blocks referenced by the previous version are missing or zero length, write new blocks rather than referencing them. This allows the archive to better recover from filesystem corruption so that at least new backups are fully readable.

• Deprecate low-value --metrics-json.