Created
February 23, 2021 06:28
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| param ( | |
| [Parameter( | |
| Mandatory = $true, | |
| HelpMessage = "Source directory for backup." | |
| )] | |
| [string]$sourceDirectory, | |
| [Parameter( | |
| Mandatory = $true, | |
| HelpMessage = "Destination directory for archive." | |
| )] | |
| [string]$destinationDirectory, | |
| [Parameter( | |
| Mandatory = $true, | |
| HelpMessage = "Base name for backup archive." | |
| )] | |
| [string]$archiveName, | |
| [Parameter( | |
| HelpMessage = "Number of days between full backups." | |
| )] | |
| [int]$dayBetweenFulls = 7, | |
| [Parameter( | |
| HelpMessage = "Number of full backups to keep in rotation." | |
| )] | |
| [int]$fullsToKeep = 7, | |
| [Parameter( | |
| HelpMessage = "Mode of differential backup." | |
| )] | |
| [ValidateSet("incemental", "decremental", IgnoreCase = $false)] | |
| [int]$backupMode = "incemental" | |
| ) | |
| $fileDateTime = Get-Date -Format FileDateTime | |
| $backupRegex = "^$archiveName-[0-9]{8}T[0-9]{10}" | |
| $fullBackupExtension = ".full" | |
| $incrementalBackupExtension = ".incr" | |
| $decrementalBackupExtension = ".incr" | |
| $archiveExtension = ".7z" | |
| $backups = Get-ChildItem -File -Path $destinationDirectory | |
| $fullBackups = $backups | Where-Object { $_.Name -match $backupRegex + $fullBackupExtension + $archiveExtension } | |
| $lastFullBackup = $fullBackups | Select-Object -Last 1 | |
| if (!$lastFullBackup) { | |
| # first run, create full backup | |
| $archivePath = Join-Path -Path $destinationDirectory -ChildPath ($archiveName + "-" + $fileDateTime + $fullBackupExtension + $archiveExtension) | |
| $7zipArgs = @( | |
| "a"; # add to archive | |
| "-mx=9"; # ultra compresion | |
| "-mhe"; # encrypt filenames | |
| "-t7z"; # use 7z format | |
| $archivePath; | |
| $sourceDirectory; | |
| ) | |
| 7z @7zipArgs | |
| } | |
| elseif ($lastFullBackup.LastWriteTime -lt (Get-Date).AddDays(-$dayBetweenFulls)) { | |
| # last full run is too old, create full backup | |
| $archivePath = Join-Path -Path $destinationDirectory -ChildPath ($archiveName + "-" + $fileDateTime + $fullBackupExtension + $archiveExtension) | |
| $7zipArgs = @( | |
| "a"; # add to archive | |
| "-mx=9"; # ultra compresion | |
| "-mhe"; # encrypt filenames | |
| "-t7z"; # use 7z format | |
| $archivePath; | |
| $sourceDirectory; | |
| ) | |
| 7z @7zipArgs | |
| # delete backups older that are N number(fullsToKeep) of full backups | |
| # code goes here | |
| } | |
| elseif ($backupMode.Equals("incemental")) { | |
| # create differential backup in decremental mode | |
| # This code does increment only on latest full not a chain to safe space full<-incremenal<-incremental | |
| # $archivePath = Join-Path -Path $destinationDirectory -ChildPath ($archiveName + "-" + $fileDateTime + $incrementalBackupExtension + $archiveExtension) | |
| # $7zipArgs = @( | |
| # "u"; # add to archive | |
| # "-mx=9"; # ultra compresion | |
| # "-mhe"; # encrypt filenames | |
| # "-t7z"; # use 7z format | |
| # $lastFullBackup.FullName; | |
| # $sourceDirectory; | |
| # "-u-"; | |
| # "-up0q3r2x2y2z0w2!$archivePath"; | |
| # ) | |
| # 7z @7zipArgs | |
| } | |
| elseif ($backupMode.Equals("decremental")) { | |
| # create differential backup in decremental mode | |
| # probably implement https://superuser.com/a/1121482/696441 | |
| } | |
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