Scheduled rsync backup in Windows 10 scheduled task

backup_remote.sh

# Use LF EOLs, not CRLFs, or backup folder might get CR in its name.
rsync --timeout=60 -aP --append-verify --stats user@host:/folder /cygdrive/f/backup
echo Done `date`

backup_remote.xml

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.4" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
  <RegistrationInfo>
    <Date>2015-08-21T15:53:33.8985969</Date>
    <Author>xxx\xxx</Author>
    <URI>\Backup remote</URI>
  </RegistrationInfo>
  <Triggers>
    <CalendarTrigger>
      <StartBoundary>2015-08-21T04:44:44</StartBoundary>
      <Enabled>true</Enabled>
      <ScheduleByWeek>
        <DaysOfWeek>
          <Tuesday />
        </DaysOfWeek>
        <WeeksInterval>1</WeeksInterval>
      </ScheduleByWeek>
    </CalendarTrigger>
  </Triggers>
  <Principals>
    <Principal id="Author">
      <UserId>xxx</UserId>
      <LogonType>Password</LogonType>
      <RunLevel>LeastPrivilege</RunLevel>
    </Principal>
  </Principals>
  <Settings>
    <MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>
    <DisallowStartIfOnBatteries>true</DisallowStartIfOnBatteries>
    <StopIfGoingOnBatteries>true</StopIfGoingOnBatteries>
    <AllowHardTerminate>true</AllowHardTerminate>
    <StartWhenAvailable>false</StartWhenAvailable>
    <RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>
    <IdleSettings>
      <StopOnIdleEnd>true</StopOnIdleEnd>
      <RestartOnIdle>false</RestartOnIdle>
    </IdleSettings>
    <AllowStartOnDemand>true</AllowStartOnDemand>
    <Enabled>false</Enabled>
    <Hidden>true</Hidden>
    <RunOnlyIfIdle>false</RunOnlyIfIdle>
    <DisallowStartOnRemoteAppSession>false</DisallowStartOnRemoteAppSession>
    <UseUnifiedSchedulingEngine>true</UseUnifiedSchedulingEngine>
    <WakeToRun>true</WakeToRun>
    <ExecutionTimeLimit>PT0S</ExecutionTimeLimit>
    <Priority>7</Priority>
  </Settings>
  <Actions Context="Author">
    <Exec>
      <Command>C:\cygwin64\bin\bash.exe</Command>
      <Arguments>-l -c "/backup_remote.sh  &gt;&gt; backup_remote.log 2&gt;&amp;1"</Arguments>
      <WorkingDirectory>C:\cygwin64\bin</WorkingDirectory>
    </Exec>
  </Actions>
</Task>

--append-verify reliably resumes large files (and skips everything else). For the full command explanation, see ExplainShell.com

For text files, use -z and for non-appending updates, use -c (which is horribly slow on TBs of data as it first checksums all that before sending the file list -_-).

Here's a nice script with incremental backups of the past 29 days: http://webgnuru.com/linux/rsync_incremental.php

Alternatives are here: https://wiki.archlinux.org/index.php/Backup_programs