Add mtsaver to Backup section - differential backup archives tool

[f1mishutka]

Former PR: awesome-foss/awesome-sysadmin#659

• Submit one item per pull request. This eases reviewing and speeds up inclusion.
• Your addition is Free software.
• You have searched the repository for any relevant issues or PRs, including closed ones.
• Any software you are adding is not already listed at any of awesome-selfhosted, dbdb.io.
• Software you are submitting is not your own, unless you have a healthy ecosystem with a few contributors (which aren't your sock puppet accounts).
• The file you are adding is formatted as described in addition.md.
• Demo links should only be used for interactive demos, i.e. not video demonstrations. If login credentials are required to access the demo, please link to the credentials directly.
• Comments and unused optional fields have been removed.
• The file you are adding uses kebab-case file naming, for example my-awesome-software.yml.
• Values for platform should match the platforms required to install and run the software.
• Any software project you are adding to the list is actively maintained.
• Any software project you are adding was first released more than 12 months ago.
• Any software project you are adding has working installation instructions.
• You understand that your Pull Request will be merged at least ~1 week after approval, depending on maintainers time.

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Please take some time to answer the following questions as best you can:

• Why is it awesome?

mtsaver is a simple tool that requires no complex setups, creates no custom format backups, just usual 7-zip archives. No need for any software (including itself) to inspect or unpack created backups. Perfectly solves simple task of backuping directory with files changed periodically. Allows flexible archives retention schemes, archive encryption.

• Have you used it? For how long?

Use it for personal backups since 2023. And use it at work to backup directories with corporate documents archive (for several companies).

• Is this in a personal or professional setup?

More a kind of personal. But used for professional backups as well. It is mostly about simple backup solution for everyone.

• How many devices/users/services/... do you manage with it?

40-50

• Biggest pros/cons compared to other solutions?

Biggest Pros: simplicity - no installation, no repository setup, no database required.

• Any other comments about your use case, things you've found excellent, limitations you've encountered... ?

Combined mtsaver with syncthing and we have distributed, selfhosted-cloud-stored and FREE differential backup folder history for half a year without any complex software used.