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我有一个生成 .tar.zg 备份文件的 Web 服务器，我想将这些备份文件自动传输到 AWS 服务器。

为了实现这一点，我尝试在 AWS 服务器上编写一个 bash 脚本，该脚本将自动检查 Web 服务器上的新备份，并在更新时制作备份副本（保留时间戳）。

有没有更简单或更强大的方法来解决这个问题？我的 FTP 脚本语法是否正确？

# Credentials to access other machine
HOST=xxxxxx 
USER=xxxxx
PASSWD=xxxxxxx

# path to the remoteBackups
remoteBackups=/home/ubuntu/testBackups

# Loops indefinitly 
#while [[ true  ]]
#do

# FTP to remote host and get the name most recent backup 
ftp -inv $HOST<<-EOT
user $USER $PASSWD
#Store name of most recent backup to FILE
# does this work or will it just save it to a variable FILE on the 
remote machine 
FILE=`ls -t ~/Desktop/backups/*.tar.gz | head -1`
bye
EOT

# For testing
echo $FILE

# Copy (preserving modification dates) file to the local remote 
backups folder on aws server
#scp -p -i  <.pem> $FILE $remoteBackups

# Get the most recent back up from both directories
latestLocal=`ls -t ~/intranetBackups/*.tar.gz | head -1`
latestRemote=`ls -t $remoteBackups/*.tar.gz | head -1`

# For testing
echo $latestLocal 
echo $latestRemote

# If the backup from the remote is newer then save to backups and 
sleep for 15 days
if [[ $latestLocal -ot $latestRemote ]]
then
    echo Transferring backup from $latestRemote to $latestLocal
    sleep 15d
else
    echo No new backup file found
    sleep 1d
fi

# If there are more than 20 backups delete the oldest
if [[ `ls -1 ~/intranetBackups | wc -l` -ge 20 ]]
then
    rm `ls -t ~/intranetBackuos | tail -1`
    echo removed the oldest backup
else
    echo no file to be removed
fi
#done
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