borg: add page (tldr-pages#1631)

pages/common/borg.md

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+# borg
+
+> Deduplicating backup tool.
+> Creates local or remote backups that are mountable as filesystems.
+
+- Initialise a (local) repository:
+
+`borg init {{/path/to/repo_folder}}`
+
+- Backup a folder into the repository, creating an archive called "Monday":
+
+`borg create --progress {{/path/to/repo_folder}}::{{Monday}} {{/path/to/source_folder}}`
+
+- List all archives in a repository:
+
+`borg list {{/path/to/repo_folder}}`
+
+- Extract a specific folder from the "Monday" archive in a remote repository, excluding all *.ext files:
+
+`borg extract {{user}}@{{host}}:{{/path/to/repo_folder}}::{{Monday}} {{path/to/target_folder}} --exclude '{{*.ext}}'`
+
+- Prune a repository by deleting all archives older than 7 days, listing changes:
+
+`borg prune --keep-within {{7d}} --list {{/path/to/repo_folder}}`
+
+- Mount a repository as a FUSE filesystem:
+
+`borg mount {{/path/to/repo_folder}}::{{Monday}} {{/path/to/mountpoint}}`
+
+- Display help on creating archives:
+
+`borg create --help`