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update sparse restore changelog

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Michael Eischer
2022-09-04 11:03:59 +02:00
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Enhancement: Restore files with many zeros as sparse files
On all platforms except Windows, the restorer may now write files containing
long runs of zeros as sparse files (also called files with holes): the zeros
are not actually written to disk.
How much space is saved by writing sparse files depends on the operating
system, file system and the distribution of zeros in the file.
During backup restic still reads the whole file including sparse regions. We
have optimized the processing speed of sparse regions.
https://github.com/restic/restic/issues/79
https://github.com/restic/restic/issues/3903
https://github.com/restic/restic/pull/2601
https://github.com/restic/restic/pull/3854
https://forum.restic.net/t/sparse-file-support/1264