docs: update README

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ttionya
2021-02-24 01:13:57 +08:00
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commit d00f49d9dd
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@@ -187,7 +187,9 @@ Default: `0`
#### BACKUP_FILE_DATE_SUFFIX
Each backup file is suffixed by default with `%Y%m%d`. If you back up your vault multiple times a day that suffix is not unique anymore.
This environment variable allows you to append that date (`%Y%m%d${BACKUP_FILE_DATE_SUFFIX`) suffix in order to create a unique backup name.
This environment variable allows you to append that date (`%Y%m%d${BACKUP_FILE_DATE_SUFFIX`) suffix in order to create a unique backup name.
Note that only numbers, upper and lower case letters, `-`, `_`, `%` are supported.
Please use the [date man page](https://man7.org/linux/man-pages/man1/date.1.html) for the format notation.