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27 lines
1.4 KiB
Text
27 lines
1.4 KiB
Text
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Enhancement: Add option to let backup trust mtime without checking ctime
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The backup command used to require that both ctime and mtime of a file matched
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with a previously backed up version to determine that the file was unchanged.
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In other words, if either ctime or mtime of the file had changed, it would be
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considered changed and restic would read the file's content again to back up
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the relevant (changed) parts of it.
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The new option --ignore-ctime makes restic look at mtime only, such that ctime
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changes for a file does not cause restic to read the file's contents again.
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The check for both ctime and mtime was introduced in restic 0.9.6 to make
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backups more reliable in the face of programs that reset mtime (some Unix
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archivers do that), but it turned out to often be expensive because it made
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restic read file contents even if only the metadata (owner, permissions) of
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a file had changed. The new --ignore-ctime option lets the user restore the
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0.9.5 behavior when needed. The existing --ignore-inode option already turned
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off this behavior, but also removed a different check.
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Please note that changes in files' metadata are still recorded, regardless of
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the command line options provided to the backup command.
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https://github.com/restic/restic/issues/2495
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https://github.com/restic/restic/issues/2558
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https://github.com/restic/restic/issues/2819
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https://github.com/restic/restic/pull/2823
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